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WX 301 EXAM 1 QUESTIONS AND CORRECT ANSWERS
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WX 301 EXAM 1 QUESTIONS AND CORRECTANSWERS 2024-2025
List three common units of atmospheric pressure: inches of mercury (HG), Millibars
(MB), and hecto-pascals (hPa).
What is the difference between station pressure and sea level pressure? Station
pressure: the presssure measured directly by a barometer. Minor corrections for
temperature and latitude.
Sea level pressure: the station pressure corrected for altitude. Multiple ways to correct
for altitude
Explain the difference between altimeter setting and "actual" sea level pressure -
Answer altimeter setting: FAA uses a constant "standard Atmosphere. Indepent of
weather and location
Sea Level pressure: NWS uses current and past 12 hr temperature combined with
climatology for site. Weather and location
Identify the altitude a pressure altimeter will read when the Kollsman window is set to
the "standard" mean sea-level pressure - Answer 29.92
Determine the altitude that a pressure altimeter will indicate when the Kollsman window
is set to the current altimeter setting. - Answer mean sea level
List three most common errors in altimeter reading - Answer sea level pressure,
temperature (cold and hot), and strong vertical gust (mountain and thunderstorm)
Determine the only altimeter error that the altimeter setting corrects - Answer sea level
pressure
, Explain how changes in surface pressure and changes in temperature affect altimeter
readings. - Answer Temperature: during cold weather vertical separation is necessary
and make sure to have extra altitude.
Surface Pressure: when flying in high you are fine but flying in cold you need to adjust
altitude.
Describe how nonstandard temperatures will affect density altitude. Low density
altitude increases performance--air is more dense and provides greater lift and thrust
High density altitude can be dangerous, especially if an aircraft is critically loaded.
Describe how high density altitudes affect aircraft performance. More engine power to
compensate for low-density air
Slower rates of climb
Longer take-off and landing rolls
RA - Answer RAIN
SN - Answer SNOW
BR - Answer MIST
FG - Answer FOG
SHRA - Answer RAIN SHOWER
TSRA - Answer THUNDER STORM
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